Pressure cooker



FIG. 1 is a perspective view of a pressure cooker;

FIG. 2 is a top plan view of the pressure cooker;

FIG. 3 is a front view of the pressure cooker;

FIG. 4 is a bottom plan view of the pressure cooker;

FIG. 5 is a rear view of the pressure cooker; and,

FIG. 6 is a left side view of the pressure cooker. 

The ornamental design for a pressure cooker, as shown and described. 